#!/bin/bash
# Pi-hole: A black hole for Internet advertisements
# (c) 2015, 2016 by Jacob Salmela
# Network-wide ad blocking via your Raspberry Pi
# http://pi-hole.net
# Controller for all pihole scripts and functions.
#
# Pi-hole is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.

PI_HOLE_SCRIPT_DIR="/opt/pihole"
# Must be root to use this tool
if [[ ! $EUID -eq 0 ]];then
  if [ -x "$(command -v sudo)" ];then
    exec sudo bash "$0" "$@"
    exit $?
  else
    echo "::: sudo is needed to run pihole commands.  Please run this script as root or install sudo."
    exit 1
  fi
fi

whitelistFunc() {
 "${PI_HOLE_SCRIPT_DIR}"/list.sh "$@"
  exit 0
}

blacklistFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/list.sh "$@"
  exit 0
}

debugFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/piholeDebug.sh
  exit 0
}

flushFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/piholeLogFlush.sh
  exit 0
}

updatePiholeFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/update.sh
  exit 0
}

reconfigurePiholeFunc() {
  /etc/.pihole/automated_install/basic-install.sh --reconfigure
  exit 0;
}

updateGravityFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/gravity.sh "$@"
  exit 0
}

setupLCDFunction() {
  "${PI_HOLE_SCRIPT_DIR}"/setupLCD.sh
  exit 0
}

queryFunc() {
  domain="${2}"
  for list in /etc/pihole/list.*; do
    count=$(grep ${domain} $list | wc -l)
    echo "::: ${list} (${count} results)"
    if [[ ${count} > 0 ]]; then
      grep ${domain} ${list}
    fi
    echo ""
  done
  exit 0
}

chronometerFunc() {
  shift
  "${PI_HOLE_SCRIPT_DIR}"/chronometer.sh "$@"
  exit 0
}


uninstallFunc() {
  "${PI_HOLE_SCRIPT_DIR}"/uninstall.sh
  exit 0
}

versionFunc() {
  shift
  "${PI_HOLE_SCRIPT_DIR}"/version.sh "$@"
  exit 0
}

restartDNS() {
  dnsmasqPid=$(pidof dnsmasq)
  if [[ ${dnsmasqPid} ]]; then
    # service already running - reload config
    if [ -x "$(command -v systemctl)" ]; then
      systemctl restart dnsmasq
    else
      service dnsmasq restart
    fi
  else
    # service not running, start it up
    if [ -x "$(command -v systemctl)" ]; then
      systemctl start dnsmasq
    else
      service dnsmasq start
    fi
  fi
}

piholeEnable() {
  if [[ "${1}" == "0" ]] ; then
    #Disable Pihole
    sed -i 's/^addn-hosts/#addn-hosts/' /etc/dnsmasq.d/01-pihole.conf
    echo "::: Blocking has been disabled!"
  else
    #Enable pihole
    echo "::: Blocking has been enabled!"
    sed -i 's/^#addn-hosts/addn-hosts/' /etc/dnsmasq.d/01-pihole.conf
  fi
  restartDNS
}

piholeLogging() {
  shift

  if [[ "${1}" == "off" ]] ; then
    #Disable Logging
    sed -i 's/^log-queries/#log-queries/' /etc/dnsmasq.d/01-pihole.conf
    sed -i 's/^QUERY_LOGGING=true/QUERY_LOGGING=false/' /etc/pihole/setupVars.conf
    pihole -f
    echo "::: Logging has been disabled!"
  elif [[ "${1}" == "on" ]] ; then
    #Enable logging
    sed -i 's/^#log-queries/log-queries/' /etc/dnsmasq.d/01-pihole.conf
    sed -i 's/^QUERY_LOGGING=false/QUERY_LOGGING=true/' /etc/pihole/setupVars.conf
    echo "::: Logging has been enabled!"
  else
    echo "::: Invalid option passed, please pass 'on' or 'off'"
    exit 1
  fi
  restartDNS
}

piholeStatus() {
  if [[ $(grep -i "^#addn-hosts=/" /etc/dnsmasq.d/01-pihole.conf) ]] ; then
    #list is commented out
    if [[ "${1}" == "web" ]] ; then
      echo 0;
    else
      echo "::: Pi-hole blocking is Disabled";
    fi
  elif [[ $(grep -i "^addn-hosts=/" /etc/dnsmasq.d/01-pihole.conf) ]] ; then
    #list set
    if [[ "${1}" == "web" ]] ; then
      echo 1;
    else
      echo "::: Pi-hole blocking is Enabled";
    fi
  else
    #addn-host not found
    if [[ "${1}" == "web" ]] ; then
      echo 99
    else
      echo ":::  No hosts file linked to dnsmasq, adding it in enabled state"
    fi
    #add addn-host= to dnsmasq
    echo "addn-hosts=/etc/pihole/gravity.list" >> /etc/dnsmasq.d/01-pihole.conf
    restartDNS
  fi
}


helpFunc() {
	cat << EOM
::: Control all PiHole specific functions!
:::
::: Usage: pihole [options]
:::		Add -h after -w (whitelist), -b (blacklist), or -c (chronometer)  for more information on usage
:::
::: Options:
:::  -w, whitelist            Whitelist domains
:::  -b, blacklist            Blacklist domains
:::  -d, debug                Start a debugging session if having trouble
:::  -f, flush                Flush the pihole.log file
:::  -up, updatePihole        Update Pi-hole
:::  -g, updateGravity        Update the list of ad-serving domains
:::  -s, setupLCD             Automatically configures the Pi to use the 2.8 LCD screen to display stats on it
:::  -c, chronometer          Calculates stats and displays to an LCD
:::  -h, help                 Show this help dialog
:::  -v, version              Show current versions
:::  -q, query                Query the adlists for a specific domain
:::  -l, logging              Enable or Disable logging (pass 'on' or 'off')
:::  uninstall                Uninstall Pi-Hole from your system :(!
:::  status                   Is Pi-Hole Enabled or Disabled
:::  enable                   Enable Pi-Hole DNS Blocking
:::  disable                  Disable Pi-Hole DNS Blocking
:::  restartdns               Restart dnsmasq
EOM
  exit 1
}

if [[ $# = 0 ]]; then
  helpFunc
fi

# Handle redirecting to specific functions based on arguments
case "${1}" in
  "-w" | "whitelist"            ) whitelistFunc "$@";;
  "-b" | "blacklist"            ) blacklistFunc "$@";;
  "-d" | "debug"                ) debugFunc;;
  "-f" | "flush"                ) flushFunc;;
  "-up" | "updatePihole"        ) updatePiholeFunc;;
  "-r"  | "reconfigure"         ) reconfigurePiholeFunc;;
  "-g" | "updateGravity"        ) updateGravityFunc "$@";;
  "-s" | "setupLCD"             ) setupLCDFunction;;
  "-c" | "chronometer"          ) chronometerFunc "$@";;
  "-h" | "help"                 ) helpFunc;;
  "-v" | "version"              ) versionFunc "$@";;
  "-q" | "query"                ) queryFunc "$@";;
  "-l" | "logging"              ) piholeLogging "$@";;
  "uninstall"                   ) uninstallFunc;;
  "enable"                      ) piholeEnable 1;;
  "disable"                     ) piholeEnable 0;;
  "status"                      ) piholeStatus "$2";;
  "restartdns"                  ) restartDNS;;
  *                             ) helpFunc;;
esac